Matrix Pencil for Positioning in Wireless ad hoc Sensor Network

Song, Liang; Adve, Raviraj; Hatzinakos, Dimitrios

doi:10.1007/978-3-540-24606-0_2

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…The clockoffset is obtained from the proposed TR-TS method (5). The OFDM symbol timing error timing error δ A is estimated with high resolution using a matrix pencil method [15]- [17], [42]. Note that the clock-offset estimation relies on the phase slope δ, that is estimated using the proposed FFT-WLS algorithm in Section IV-B.…”

Section: Ofdm-ranging Using the Tr-ts Methodsmentioning

confidence: 99%

“…It corresponds to the difference detected between the beginning of the OFDM symbol and the true ToA of the line-of-sight path. In this paper, matrix mencil method is employed for the high-resolution multipath delay estimation [15]- [17], [42]. The main motivation for using the matrix pencil method is that it possesses superior time resolution compared with the classical timing estimation methods (e.g., based on FFT or correlation [32], [33], [50]) that are limited to the sampling period resolution.…”

Section: Cramér-rao Lower Boundmentioning

confidence: 99%

“…An additional time-of-arrival (ToA) estimation technique is employed to estimate the distance between two OFDM radios. In this paper, a matrix pencil method is used to estimate the delay corresponding to the first arrival path [15]- [17]. 4) The impact of various nonidealities on the proposed methods are studied: message delivery delays, channel nonstationarity, clock drifts, and carrier frequency offsets.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Time Synchronization and Ranging in OFDM Systems Using Time-Reversal

Abrudan

Haghparast

Koivunen

2013

IEEE Trans. Instrum. Meas.

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In this paper, we propose a new two-way time synchronization (TS) method for orthogonal frequency division multiplexing (OFDM)-based wireless systems. It relies on the time-reversal (TR) technique to remove the effect of the channel phase after the signal round-trip. Thus, the method is named TR-TS. TR technique yields a linear phase rotation across subcarriers, regardless whether the channel is minimum, maximum, or mixed phase. This phase is proportional to the difference of the OFDM symbol-timing synchronization errors at the two receivers. Thus, the clock-offset between the radios is determined using the local reception times and the estimated linear phase resulting from the TR technique. A reliable low-complexity algorithm called fast Fourier transform-weighted least-squares is proposed to estimate the linear phase slope, and its meansquare error is compared with the Cramér-Rao Lower Bound (CRLB). The results show that the proposed algorithm attains the CRLB at low SNR, even when a single OFDM symbol is used. The OFDM packets are time-stamped at the medium access control layer, which allows eliminating errors caused by different and varying delays in the internal lower level processing of the data. Hence, an accurate estimate of the clock-offset is obtained. The impact of various nonidealities on the proposed algorithm is also studied. In addition, we propose a ranging method that employs the novel TS method and a first-path delay estimation technique. The performance of the proposed methods is studied in simulations, as well as using real-world measured channels. The results show that the proposed methods can be successfully applied in low to moderate mobility scenarios such as indoors despite harsh multipath, since they rely on channel reciprocity.

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Section: Ofdm-ranging Using the Tr-ts Methodsmentioning

confidence: 99%